CIFS with Windows Server 2003

Hello
I have strange problem when mounting a partition from "Windows Server
2003 3790 Service Pack 1"

I perform the following command:
# mount.cifs //remote.comp/service /mnt_point -o
domain=my_domain,user=my_user,password=my_pa
<<Everything is OK. No messages on the console and in the log>>

# cd /mnt_point
<<Everything is OK. No messages on the console and in the log>>

# ls
dir1 dir2 file1 file2
<<Everything is OK. No messages on the console and in the log>>

# cd dir1
dir1 #
<<Everything is OK. No messages on the console and in the log>>

dir1 # ls
dir1 dir2 file1 file2
<<ERROR !!! It lists the /mnt_point directory and not dir1
subdirectory>>
<<No messages on the console and in the log>>

# cd /root/
# umount.cifs /mnt_point
<<No problem. Everything is OK. No messages on the console and in the
log>>

My kernel 2.6.17.13 configuration looks like:
<*> CIFS support (advanced network filesystem for Samba, Window and
other CIFS compliant servers)
[*] CIFS statistics
[*] CIFS extended statistics
[*] CIFS extended attributes
[*] CIFS POSIX Extensions
[*] CIFS Experimental Features (EXPERIMENTAL)
[*] CIFS Kerberos/SPNEGO advanced session setup
(EXPERIMENTAL)

When I try to mount it using Samba I receive the following message:
cli_negprot: SMB signing is mandatory and we have disabled it.
6477: protocol negotiation failed
SMB connection failed

I was trying to set the following 3 flags in smb.conf with no effect:
client signing = auto | mandatory | disabled

I succeeded with accessing it using smbclient directly:
smbclient //remote.comp/service -U "domain\user"

??? DO YOU HAVE ANY IDEA WHY I CAN'T MOUNT THAT PARTITION ???

Thank You for any help

.

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